Hello , my daughter is 15 years old , when she was 4 she was diagnoased with mitral valve prolapse ... So 5 days ago she started complaining about neck pain and her ears got blocked , now its a little bit better , but she is complaining now about chest pain and how very little activity gets her heart beating so fast or racing . She got her period yesterday , Today she told me that she has a dark stoll but she only realized the matter with the dark stool once.... Should i be worried ?? should we go see a doctor ?? or could all that be from her period?? I hope i get an answer from u soon...Thanks in advance :)